I recently finished shopping my first pin (Baywatch) and I am anxious to do my first toy mod on the machine. I purchased a diecast HH-65C Dolphin helicopter (Amazon for $11.49 w/ shipping) and now I want to deck it out with LEDs and a small motor to run the blades during certain gameplay modes. The chopper is going to be placed in the upper right corner of the playfield (with my preliminary calculations it should fit perfectly, but we'll see.).
I was first inspired for this project by watching videos from Ed Cheung's Robot toy mod http://www.edcheung.com/album/album08/pinball/tz2.htm and also from the mods done by this fellow in Germany http://wolfsoft.de/wordpress/?cat=17 (Especially interested in the rotating UFO mod w/ LED's he has for ATM/RFM.
I am looking for any advice that may be out there before I dive into this project. Thank you for your help.

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Thanks for the input so far. I definitely wasn't planning on drilling any new holes or making any modifications that can't be put back to original. Using wire to support the mod is a great tip. There are 3-4 screws that hold down clear plastic pieces that are connected to the plastic ramp in the upper right of the machine(behind "Tourist Season" and "IRONMAN" signs). I was planning on using those as my anchor points whether I decide to use wire for supports or if I fabricate some sort of bracket.
The mounting part isn't as much of a concern to me at this point, its more of how to get power for the LEDs. I'm looking to wire up 3mm or 5mm LEDs in series with the proper resistor attached (been learning a lot from Youtube), but i want to make sure it's ok to jump power off of certain lighting circuits to make them work. I also have no idea what sort of motor to look for when it comes to powering the helicopter blades.

Thanks robin. Any ideas on what type(and where to buy) of low voltage motor I can use to power the helicopter blades that will run off of a GI circuit or flasher? Would something like this work?http://www.radioshack.com/product/index.jsp?productId=2102828

Update on my progress.
Here is a vid as well.

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So now that i have the blades working well off of 3V(2 AA batteries), any ideas on how to get the motor to work correctly off of a lighting circuit on the machine? I don't want to just start hooking up wires willy-nilly and have things catch on fire. I'm thinking that i need to have a diode or something in front of the motor, but I'm not exactly sure.
Another thing is, I need to figure out the combination of LED lights that I want to put on the Helicopter(They will be 3mm and/or 5mm). I'm thinking one circuit 2 blue 1 orange, second circuit one red one white...Yea or nay???

Pic of helicopter for lights that I'm going off:

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Today I ordered some stuff from superbrightleds.com. I got a variety of colors of both 3mm and 5mm LED's, a ton of resistors, and some mounting bezels and caps. Now it's time to play the waiting game for the mailman. BTW thanks again for all of the helpful comments and suggestions, it makes this little project all the more exciting to accomplish.

So right now I'm at a stand still with this mod because i'm waiting for the LED's to arrive. Anyway the motor that I'm using currently comes from a cheap fan that I bought. I started to wonder if the motor was going to get too hot if it ran for a long time. The fan is powered by 2AA batteries(3v total). I decided to make the motor run the blades for about 90 seconds to see how hot the motor would get. After the test, I felt the little motor and it was super hot to the touch. This can't be good.
The next test that I did was to just hook up one AA battery(1.5V) to see how it worked. The blades seem to turn at the same rate, and i held the motor in my fingers letting the blades turn for about 3 1/2 minutes without the motor getting hot.
I guess 3v is too high and i need to drop it down around 1.5v. How do you calculate how many diodes to add to drop the voltage?

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You don't have to buy the pin, just pretend you have it and make the mod. That's what I do. I'm already thinking of one for BTTF and I don't own it.

LED's and diodes finally arrived today! Time to start drilling some holes.

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First nite class: LED 101

Teacher:

Books/Materials:
1. (Breadboard) http://www.radioshack.com/product/index.jsp?productId=2734155 ,
2. (5mm Orange LED) http://www.superbrightleds.com/moreinfo/component-leds/5mm-orange-led-30-degree-viewing-angle-4000-mcd/293/1220/ ,
3. (39 Ohm Resistor) http://www.superbrightleds.com/moreinfo/resistors/1-4-watt-carbon-film-resistors-through-hole/901/2229/,
4. (Best wire I could find lying around) Cat-5 wire from personal stash ,
5. 2 AA Batteries

Cheat Sheet:
http://led.linear1.org/led.wiz Thanks Robin!

***Vid/Pics of homework to follow soon...

I dig the 3mm blue ones...

Drill bit to plastic... Here is the result.

I need to put in the time and finish this one. Thanks for the encouragement. I'll keep ya posted.

Lookin good Mystic.